PFH1184341: Georgia: A 15th century plaque depicting Saint George rescuing the emperor's daughter / Bridgeman Images

PFH1184358: India: Royal cenotaphs (chhatris) at Bada Bagh in the Thar Desert near Jaisalmer / Bridgeman Images

PFH1184359: India: Royal cenotaphs (chhatris) at Bada Bagh in the Thar Desert near Jaisalmer / Bridgeman Images

PFH1184369: Vietnam: The Cao Dai temple at the Cao Dai Holy See, Tay Ninh Province / Bridgeman Images

PFH1184371: Vietnam: The Cao Dai temple at the Cao Dai Holy See, Tay Ninh Province / Bridgeman Images

PFH1184376: Vietnam: Dragon pillars at the Cao Dai temple in the Cao Dai Holy See, Tay Ninh Province / Bridgeman Images

PFH1184382: Vietnam: Cao Dai monks at the Cao Dai Holy See in Tay Ninh Province / Bridgeman Images

PFH1184387: Turkey: British forces during the landing at West Beach, Gallipoli, Dardanelles Campaign, 1915, Unknown photographer, (20th century) / Bridgeman Images

PFH1185393: Thailand: Ho trai (library), chedi and viharn, Wat Chiang Man, Chiang Mai / Bridgeman Images

PFH1185411: China: The Leifeng Pagoda overlooking Xi Hu (West Lake), Hangzhou / Bridgeman Images

PFH1185413: China: The Leifeng Pagoda overlooking Xi Hu (West Lake), Hangzhou / Bridgeman Images

PFH1185431: India / China: The 'Examining Hall' in a Patna opium factory with hundreds of opium balls prepared for use in the China trade. Lithograph, W. S. Sherwell, c. 1850 / Bridgeman Images

PFH1185436: Laos: Tour boats moored below the Pak Ou Caves, Luang Prabang / Bridgeman Images

PFH1185437: Laos: Tour boats moored below the Pak Ou Caves, Luang Prabang / Bridgeman Images

PFH1185444: Laos: The Mekong River below the Pak Ou Caves, Luang Prabang / Bridgeman Images

PFH1185447: Laos: Tour boats moored below the Pak Ou Caves, Luang Prabang / Bridgeman Images

PFH1185448: Vietnam: Entrance to the Buddhist shrines inside caves in the Marble Mountains, near Danang / Bridgeman Images

PFH1185457: Vietnam: Detail on one of the Nine Dynastic Urns in front of the Hien Lam Pavilion, The Imperial City, The Citadel, Hue / Bridgeman Images

PFH1185471: UK / England: Thomas Penson De Quincey (1785 - 1859) was an English essayist, best known for his 'Confessions of an English Opium-Eater' (1821) / Bridgeman Images

PFH1185474: Papaver somniferum, the Opium Poppy, 19th century botanical painting / Bridgeman Images

PFH1185477: USA: 'Try Dr Seth Arnold's Cough Killer: It works like Magic'. 19th century advertisement for opiate-based medicine / Bridgeman Images

PFH1185482: Cambodia: Face towers, the Bayon, Angkor Thom, Angkor / Bridgeman Images

PFH1185516: Cambodia: A lintel above a blind door showing Yama (god of death) riding a buffalo, Beng Mealea (12th century Khmer temple), 40km east of the main group of temples at Angkor / Bridgeman Images

PFH1185521: China: Ye Mincheng, Governor of Guangdong Province 1848-1858, Studio of Yeh Qua (Yehqua), c. 1858 / Bridgeman Images

PFH1185531: Cambodia: Beng Mealea (12th century Khmer temple), 40km east of the main group of temples at Angkor / Bridgeman Images

PFH1185533: Cambodia: Beng Mealea (12th century Khmer temple), 40km east of the main group of temples at Angkor / Bridgeman Images

PFH1185537: Cambodia: Bas-relief detail at Neak Pean, Angkor / Bridgeman Images

PFH1185540: Thailand: New viharn at Wat Salaeng, Ban Chom Khwan, Amphoe Long, Phrae Province / Bridgeman Images

PFH1185541: Thailand: Modern mondop (pavilion for public rituals), Wat Salaeng, Ban Chom Khwan, Amphoe Long, Phrae Province / Bridgeman Images

PFH1185543: Thailand: A standing Buddha in the varada mudra position symbolizing Charity, Wat Salaeng, Ban Chom Khwan, Amphoe Long, Phrae Province / Bridgeman Images

PFH1185544: Thailand: A standing Buddha in the varada mudra position symbolizing Charity, Wat Salaeng, Ban Chom Khwan, Amphoe Long, Phrae Province / Bridgeman Images

PFH1185547: Thailand: The main viharn at Wat Salaeng, Ban Chom Khwan, Amphoe Long, Phrae Province / Bridgeman Images

PFH1185550: Thailand: The main viharn at Wat Salaeng, Ban Chom Khwan, Amphoe Long, Phrae Province / Bridgeman Images

PFH1185572: India: Kneading crude opium with oil to make round or flat cakes at a government factory in India, late 19th century / Bridgeman Images

PFH1185583: Thailand: Chedi, Wat Na Luang, Ban Chom Khwan, Amphoe Long, Phrae Province / Bridgeman Images

PFH1185586: Thailand: Eave bracket in the form of a mythical creature, Wat Na Luang, Ban Chom Khwan, Amphoe Long, Phrae Province / Bridgeman Images